ChangeLogConsumerBaseImpl group_updateGroup does not handle description changes et. al.

The ChangeLogConsumerBaseImpl listener for group_updateGroup handles cases of a group rename. However, if some group property such as the display name or description changes, it's logged as "invalidPropertyChanged" and ignored. But it should be up to a subclass to decide whether it should handle change in these properties.

There is a stub method in the class for updateGroup(). But it is moot for subclasses to implement this, since no changelog events call it.